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| -rw-r--r-- | Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml index 04d6473d666f..a5205ee5ad0f 100644 --- a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.yaml @@ -11,6 +11,17 @@ description: | messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI agent owns registers used for notification and buffers for message. + For Versal devices, there are two types of IPI channels: + - Buffered channels: Support message passing and require the "msg" + register region to be present on both the host and remote IPI agents. + - Buffer-less channels: Support notification only and do not require the + "msg" register region. For these channels, the "msg" region should be + omitted. + + For message passing, both the host and remote IPI agents must define the "msg" + register region. If either agent omits the "msg" region, only notification + based communication is possible. + +-------------------------------------+ | Xilinx ZynqMP IPI Controller | +-------------------------------------+ |